The rules of Terrace6x6 are exactly the same as Terrace and can be found on the Terrace help page.

terrace6x6 challenge userid1 userid2
or
terrace6x6 challenge [ -short | -medium | -long | -master ] userid1 userid2
or
terrace6x6 challenge userid1 userid2 [ userid3 [ userid4 ] ]

Start a new game. Specify up to four userids. If three userids are specified and the third userid is "long", "medium" or "short", this starts a 2 player game. The 2 player long game is the default.

The initial game boards are:

      Two Player (Long/Default)        Two Player (Medium)
        a   b   c   d   e   f            a   b   c   d   e   f
      H---+---+---+---+---+---L        H---+---+---+---+---+---L
    6 | C | C | B | B | A | T | 6    6 |   | C | B | B | T |   | 6
      +---+   +   +   +   +---+        +---+   +   +   +   +---+
    5 | A   A | B | B | C   C | 5    5 |       |   |   |       | 5
      +---+---+   +   +---+---+        +---+---+   +   +---+---+
    4 |           |           | 4    4 |           |           | 4
      +---+---+---+---+---+---+        +---+---+---+---+---+---+
    3 |           |           | 3    3 |           |           | 3
      +---+---+   +   +---+---+        +---+---+   +   +---+---+
    2 | c   c | b | b | a   a | 2    2 |       |   |   |       | 2
      +---+   +   +   +   +---+        +---+   +   +   +   +---+
    1 | t | a | b | b | c | c | 1    1 |   | t | b | b | c |   | 1
      L---+---+---+---+---+---H        L---+---+---+---+---+---H
        a   b   c   d   e   f            a   b   c   d   e   f
    
      Two Player (Short)               Two Player (Master)
        a   b   c   d   e   f            a   b   c   d   e   f
      H---+---+---+---+---+---L        H---+---+---+---+---+---L
    6 |   | T | B | B | C |   | 6    6 | C | C | B | B | A | T | 6
      +---+   +   +   +   +---+        +---+   +   +   +   +---+
    5 |       |   |   |       | 5    5 | A   A | B | B | C   C | 5
      +---+---+   +   +---+---+        +---+---+   +   +---+---+
    4 |           |           | 4    4 |           |           | 4
      +---+---+---+---+---+---+        +---+---+---+---+---+---+
    3 |           |           | 3    3 |           |           | 3
      +---+---+   +   +---+---+        +---+---+   +   +---+---+
    2 |       |   |   |       | 2    2 |       |   |   |       | 2
      +---+   +   +   +   +---+        +---+   +   +   +   +---+
    1 |   | c | b | b | t |   | 1    1 |   | c | b | b | t |   | 1
      L---+---+---+---+---+---H        L---+---+---+---+---+---H
        a   b   c   d   e   f            a   b   c   d   e   f
    
      Three/Four Players
        a   b   c   d   e   f  
      H---+---+---+---+---+---L
    6 |   | T | B | B | C |   | 6
      +---+   +   +   +   +---+
    5 | t     |   |   |     C'| 5
      +---+---+   +   +---+---+
    4 | b         |         B'| 4
      +---+---+---+---+---+---+
    3 | b         |         B'| 3
      +---+---+   +   +---+---+
    2 | c'    |   |   |     T'| 2
      +---+   +   +   +   +---+
    1 |   | c | b | b | t |   | 1
      L---+---+---+---+---+---H
        a   b   c   d   e   f  

terrace6x6 move board userid password move[#moveno]

Make a move on the specified board (if it is your turn). A move is in one of the following forms:

      rc1-rc2
    s-rc1-rc2
      rc1-rc2:d
    s-rc1-rc2:d

where

s is the piece being moved (A,B,C,D,T) [ optional ]

rc1 is the starting position of the piece being moved

rc2 is the final position for the piece

d is the piece being captured [ optional ]